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5z+4z=8z+1
We move all terms to the left:
5z+4z-(8z+1)=0
We add all the numbers together, and all the variables
9z-(8z+1)=0
We get rid of parentheses
9z-8z-1=0
We add all the numbers together, and all the variables
z-1=0
We move all terms containing z to the left, all other terms to the right
z=1
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